feat(planner): per-request requestId propagated through logs

Mirrors PR #429 for the planner app. Each HTTP request now gets a
requestId (inbound X-Request-Id honored, otherwise a fresh UUID),
echoed on the response, and propagated to every downstream log call via
AsyncLocalStorage + pino's \`mixin\`.

Tests: planner logger.server.test.ts (2 cases, same shape as the
journal version).

Full repo: pnpm typecheck, pnpm lint, pnpm test all green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/planner/app/lib/logger.server.test.ts

@@ -0,0 +1,47 @@
+import { describe, it, expect } from "vitest";
+import { Writable } from "node:stream";
+import pino from "pino";
+import { AsyncLocalStorage } from "node:async_hooks";
+
+// Mirrors the journal's logger test — the mixin contract is what
+// matters: pino's `mixin` callback reads from AsyncLocalStorage and
+// tags every record with the active requestId.
+
+describe("planner logger mixin attaches requestId from async context", () => {
+  function captureLogger(als: AsyncLocalStorage<{ requestId: string }>) {
+    const lines: string[] = [];
+    const sink = new Writable({
+      write(chunk, _enc, cb) {
+        lines.push(chunk.toString());
+        cb();
+      },
+    });
+    const lg = pino(
+      {
+        level: "info",
+        mixin: () => {
+          const ctx = als.getStore();
+          return ctx ? { requestId: ctx.requestId } : {};
+        },
+      },
+      sink,
+    );
+    return { lg, lines };
+  }
+
+  it("tags log records with requestId when inside als.run()", () => {
+    const als = new AsyncLocalStorage<{ requestId: string }>();
+    const { lg, lines } = captureLogger(als);
+    als.run({ requestId: "p-abc" }, () => lg.info("hello"));
+    const record = JSON.parse(lines[0]!);
+    expect(record.requestId).toBe("p-abc");
+  });
+
+  it("omits requestId when no async context is active", () => {
+    const als = new AsyncLocalStorage<{ requestId: string }>();
+    const { lg, lines } = captureLogger(als);
+    lg.info("bare");
+    const record = JSON.parse(lines[0]!);
+    expect(record.requestId).toBeUndefined();
+  });
+});

apps/planner/app/lib/logger.server.ts

@@ -1,7 +1,25 @@
 import pino from "pino";
+import { AsyncLocalStorage } from "node:async_hooks";
+
+/**
+ * Per-request context propagated through the async stack. The HTTP
+ * server wraps each request in `requestContext.run({ requestId }, ...)`
+ * so every downstream `logger.info(...)` automatically tags log lines
+ * with `requestId` — see apps/journal/app/lib/logger.server.ts for the
+ * same pattern in the journal app.
+ */
+export interface RequestContext {
+  requestId: string;
+}
+
+export const requestContext = new AsyncLocalStorage<RequestContext>();
 
 export const logger = pino({
   level: process.env.LOG_LEVEL ?? "info",
+  mixin: () => {
+    const ctx = requestContext.getStore();
+    return ctx ? { requestId: ctx.requestId } : {};
+  },
   ...(process.env.NODE_ENV !== "production"
     ? { transport: { target: "pino-pretty" } }
     : {}),